Here’s one of the basic building blocks for avoiding Repeat nodes when you want to loop over the elements of an array. The “trick” is to use an array like [0, 1, 2, 3, 0, 1, 2, 3] as the indices for Select in Array. That way, you get an array that repeats the selected elements over and over. So instead of looping N times over an array of 4 elements, you simply have to process an array of 4 x N elements (in this example, the number of repeats N is = 3).

The above is effectively the equivalent to doing this using a Repeat node:

PS To build an array like [0, 1, 2, 3, 0, 1, 2, 3], you use the Modulo node:

To be continued…